Microfluidic device



FIG. 1 is a front side perspective view showing my new design;

FIG. 2 is an enlarged perspective view of a portion of the microfluidic device within the area identified by broken circle “FIG. 2.” in FIG. 1;

FIG. 3 is an enlarged perspective view of a portion of the microfluidic device within the area identified by broken circle “FIG. 3” in FIG. 1;

FIG. 4 is an enlarged perspective view of a portion of the microfluidic device within the area identified by broken circle “FIG. 4” in FIG. 1;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a side view thereof; and,

FIG. 8 is another side view thereof. 

I claim the ornamental design for a microfluidic device, as shown and described. 